Earlier this week, I had an idea for a game mechanic, but I haven’t found a theme that really fits. The mechanic uses a deck of cards where groups of 4 cards are laid out, face up, on the table. 2 cards are vertical, and 2 horizontal. Players take turns swapping a card from their hand with one of the cards in one of the groups, trying to make sets, runs, etc (think poker hands, or maybe Yahtzee scores), and then scoring.
My original idea for a theme was flowers, but the swapping cards really doesn’t fit that. Can anyone suggest a theme that fits? I normally use a game’s theme to guide development, but for this design, I’m stumped.